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<TITLE>JavaScript Source Code 3000:  Forms:  Checkbox Changer</TITLE>
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<META NAME="date" CONTENT="2000-09-09">
<META NAME="channel" CONTENT="Web Developer">
<META NAME="author" CONTENT="JavaScript Source Code 3000">
<META NAME="section" CONTENT="Forms">
<META NAME="description" CONTENT="Takes a series of known named checkboxes and checks or uncheck them all at once.  It can even change each checkbox to the opposite checked or not checked value.  Clever for loops!">

<SCRIPT LANGUAGE="JavaScript">




<!-- Begin
function checkAll() {
for (var j = 1; j <= 14; j++) {
box = eval("document.checkboxform.C" + j); 
if (box.checked == false) box.checked = true;
   }
}

function uncheckAll() {
for (var j = 1; j <= 14; j++) {
box = eval("document.checkboxform.C" + j); 
if (box.checked == true) box.checked = false;
   }
}

function switchAll() {
for (var j = 1; j <= 14; j++) {
box = eval("document.checkboxform.C" + j); 
box.checked = !box.checked;
   }
}
//  End -->
</script>
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<A HREF="../index.htm" /" TARGET="_top"><FONT COLOR="#0000FF"><b>Home</b></font></A>
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<A HREF="index.htm" /forms/" ><font color="#FF0000"><b>Forms</b></font></A>
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<FONT COLOR="#006666"><b>Checkbox Changer</b></font></font>
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<!-- Description --><!--content_start-->
Takes a series of known named checkboxes and checks or uncheck them all at once.  It can even change each checkbox to the opposite checked or not checked value.  Clever for loops!
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<!-- Demonstration -->
<center>
<form name=checkboxform>
<input type=checkbox name=C1 checked>C1<br>
<input type=checkbox name=C2 checked>C2<br>
<input type=checkbox name=C3 checked>C3<br>
<input type=checkbox name=C4 checked>C4<br>
<input type=checkbox name=C5 checked>C5<br>
<input type=checkbox name=C6 checked>C6<br>
<input type=checkbox name=C7 checked>C7<br>
<input type=checkbox name=C8 checked>C8<br>
<input type=checkbox name=C9 checked>C9<br>
<input type=checkbox name=C10 checked>C10<br>
<input type=checkbox name=C11 checked>C11<br>
<input type=checkbox name=C12 checked>C12<br>
<input type=checkbox name=C13 checked>C13<br>
<input type=checkbox name=C14 checked>C14<br>
<br>
<input type=button value="Check All" onClick="checkAll()"><br>
<input type=button value="Uncheck All" onClick="uncheckAll()"><br>
<input type=button value="Switch All" onClick="switchAll()"><br>
</form>
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<tr><td BGCOLOR=yellow><font FACE="helvetica,arial,geneva"><b>JavaScript Source Code 3000:  Forms:  Checkbox Changer</b>
<p>Simply click inside the window below, use your cursor to highlight the script, and copy (type Control-c or Apple-c) the script into a new file in your text editor (such as Note Pad or Simple Text) and save (Control-s or Apple-s).  The script is yours!!!
<br><br></font></td></tr>
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<form NAME="copy">

<DIV align="center">
<input type=button value="Highlight All" onClick="javascript:this.form.txt.focus();this.form.txt.select();">&nbsp;&nbsp;&nbsp;&nbsp;
<INPUT TYPE="text" NAME="total" VALUE="Script Size:  1.94 KB" size=24>
</DIV>

<textarea NAME="txt" ROWS=20 COLS=75 WRAP=VIRTUAL>

&lt;!-- TWO STEPS TO INSTALL CHECKBOX CHANGER:

  1.  Copy the coding into the HEAD of your HTML document
  2.  Add the last code into the BODY of your HTML document  --&gt;

&lt;!-- STEP ONE: Paste this code into the HEAD of your HTML document  --&gt;

&lt;HEAD&gt;

&lt;SCRIPT LANGUAGE="JavaScript"&gt;

&lt;! &gt;
&lt;! &gt;

&lt;!-- Begin
function checkAll() {
for (var j = 1; j &lt;= 14; j++) {
box = eval("document.checkboxform.C" + j); 
if (box.checked == false) box.checked = true;
   }
}

function uncheckAll() {
for (var j = 1; j &lt;= 14; j++) {
box = eval("document.checkboxform.C" + j); 
if (box.checked == true) box.checked = false;
   }
}

function switchAll() {
for (var j = 1; j &lt;= 14; j++) {
box = eval("document.checkboxform.C" + j); 
box.checked = !box.checked;
   }
}
//  End --&gt;
&lt;/script&gt;
&lt;/HEAD&gt;

&lt;!-- STEP TWO: Copy this code into the BODY of your HTML document  --&gt;

&lt;BODY&gt;

&lt;center&gt;
&lt;form name=checkboxform&gt;
&lt;input type=checkbox name=C1 checked&gt;C1&lt;br&gt;
&lt;input type=checkbox name=C2 checked&gt;C2&lt;br&gt;
&lt;input type=checkbox name=C3 checked&gt;C3&lt;br&gt;
&lt;input type=checkbox name=C4 checked&gt;C4&lt;br&gt;
&lt;input type=checkbox name=C5 checked&gt;C5&lt;br&gt;
&lt;input type=checkbox name=C6 checked&gt;C6&lt;br&gt;
&lt;input type=checkbox name=C7 checked&gt;C7&lt;br&gt;
&lt;input type=checkbox name=C8 checked&gt;C8&lt;br&gt;
&lt;input type=checkbox name=C9 checked&gt;C9&lt;br&gt;
&lt;input type=checkbox name=C10 checked&gt;C10&lt;br&gt;
&lt;input type=checkbox name=C11 checked&gt;C11&lt;br&gt;
&lt;input type=checkbox name=C12 checked&gt;C12&lt;br&gt;
&lt;input type=checkbox name=C13 checked&gt;C13&lt;br&gt;
&lt;input type=checkbox name=C14 checked&gt;C14&lt;br&gt;
&lt;br&gt;
&lt;input type=button value="Check All" onClick="checkAll()"&gt;&lt;br&gt;
&lt;input type=button value="Uncheck All" onClick="uncheckAll()"&gt;&lt;br&gt;
&lt;input type=button value="Switch All" onClick="switchAll()"&gt;&lt;br&gt;
&lt;/form&gt;
&lt;/center&gt;

 

&lt;!-- Script Size:  1.94 KB --&gt;</textarea><br><font FACE="helvetica,arial,geneva"></font></td></tr>

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